Bang & Olufsen Book of Hi-Fi

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You may may need to click on the picture to see the book cover ( if it appears at all!) Posting a picture from an iPad does not seem to be straightforward!

I picked up this book for 99p after someone in another thread asked about the wisdom of paying $85 or $95 for one!

Published 1977.

Interesting comments from that time:

"It is pointless to have a loudspeaker with a bass response down to 20 Hz in a small room. The room itself is part of your listening apparatus and the cut-off frequency of the room is inversely proportional to its length. A room 17 ft long has acut off frequency of approximately 60 Hz; to hear sound at 30 Hz it must be 34 ft long." Elsewhere it says that the laws of diminishing returns applies to speaker design and there is little benefit in having more than a woofer, mid range and tweeter in a cabinet. What does that say about the BL90?

... there is little benefit in having more than a woofer, mid range and tweeter in a cabinet. What does that say about the BL90?

It says that some people are prepared to pay a lot of money for a little benefit!

(Photo not working for me, BTW)

Finally added the pic via an iMac/ Firefox edit.

Unable to remove the previous blank post (or edit it) for some reason.

The book is quite interesting (I think you have a bargain priced one too Guy?) ,,,, of course there is a lot of emphasis on record decks/ stylus, and tape recording, of much less interest to present day listeners.

"It is pointless to have a loudspeaker with a bass response down to 20 Hz in a small room. The room itself is part of your listening apparatus and the cut-off frequency of the room is inversely proportional to its length. A room 17 ft long has acut off frequency of approximately 60 Hz; to hear sound at 30 Hz it must be 34 ft long."

Does this imply, for example, that for rooms less than 17ft square, that the BL5 and larger BL's would have little or no advantage over, say, a BL9? Does it also imply that, except for creating a surround sound effect, there is little point adding more speakers to an adequate Beovision?